Vapor Pressure Measurements for the FeCl<SUB>2</SUB>-ZnCl<SUB>2</SUB> System by the Transpiration Method

Abstract

The vapor pressures of FeCl2 and ZnCl2 in the FeCl2–ZnCl2 system were measured by the transpiration method at 873 K and 917 K. The vapor pressure data were interpreted to indicate the formation of complex ions in the FeCl2–ZnCl2 melts. It is presumed that the complex molecule FeZnCl4 as well as FeCl2 and ZnCl2 exists in the vapors in equilibrium with molten FeCl2–ZnCl2 mixtures. The activities in the FeCl2–ZnCl2 system show a negative deviation from Raoult’s law. These results suggest that the complex ions such as ZnCl 2� 4 are formed in molten FeCl2–ZnCl2 mixtures.